Method of decomposing phenolic by-product

Patent metadata

Field	Value
Publication number	US-11780796-B2
Application number	US-202017606369-A
Country	US
Kind code	B2
Filing date	Nov 23, 2020
Priority date	Jun 23, 2020
Publication date	Oct 10, 2023
Grant date	Oct 10, 2023

Abstract

The present disclosure relates to a method of decomposing a phenolic by-product, including: a step of feeding and thermally cracking a phenolic by-product stream to and in a decomposition apparatus, recovering an active ingredient from a top discharge stream, and discharging a high-boiling substance through a bottom discharge stream; a step of pressurizing each of a side discharge stream of the decomposition apparatus and a bottom discharge stream of the decomposition apparatus; a step of mixing the pressurized side discharge stream of the decomposition apparatus and the pressurized bottom discharge stream of the decomposition apparatus with each other to form a mixed stream; and a step of passing a part of the mixed stream through a reboiler, circulating the part of the mixed stream to the decomposition apparatus, and discharging a residual mixed stream.

First claim

The invention claimed is:

1. A method of decomposing a phenolic by-product, the method comprising:
a step of feeding a phenolic by-product stream to a decomposition apparatus, thermally cracking the phenolic by-product in the decomposition apparatus, recovering an active ingredient from a top discharge stream, and discharging a high-boiling substance through a bottom discharge stream;
a step of pressurizing each of a side discharge stream of the decomposition apparatus and the bottom discharge stream of the decomposition apparatus;
a step of mixing the pressurized side discharge stream of the decomposition apparatus and the pressurized bottom discharge stream of the decomposition apparatus with each other to form a mixed stream; and
a step of passing a part of the mixed stream through a reboiler, circulating the part of the mixed stream to the decomposition apparatus, and discharging a residual mixed stream.

2. The method of claim 1 , wherein the phenolic by-product includes any one or more of a phenolic by-product produced in a phenol production process and a phenolic by-product produced in a bisphenol A production process.

3. The method of claim 1 , wherein the phenolic by-product includes one or more compounds selected from the group consisting of bisphenol A, phenol, alpha-methyl styrene, acetophenone, cumyl phenol, and alpha-methyl styrene dimer.

4. The method of claim 1 , wherein the side discharge stream of the decomposition apparatus includes one or more compounds selected from the group consisting of phenol, acetophenone, alpha-methyl styrene, and cumene.

5. The method of claim 1 , wherein the side discharge stream of the decomposition apparatus comprises acetophenone in an amount of 40 wt % or more.

6. The method of claim 1 , wherein an operation pressure of the decomposition apparatus is 0.1 KG to 3 KG.

7. The method of claim 1 , wherein each of the side discharge stream of the decomposition apparatus and the bottom discharge stream of the decomposition apparatus is pressurized to a pressure of 2 KG to 16 KG.

8. The method of claim 1 , wherein each of the side discharge stream of the decomposition apparatus and the bottom discharge stream of the decomposition apparatus is pressurized using a pump.

9. The method of claim 1 , wherein a pressure of the part of the mixed stream passing through the reboiler is 2 KG to 16 KG.

10. The method of claim 1 , wherein a vapor pressure of the side discharge stream of the decomposition apparatus in a temperature range of 250° C. to 350° C. is 2 KG to 16 KG.

11. The method of claim 1 , wherein a ratio of a flow rate of the side discharge stream of the decomposition apparatus to a flow rate of the bottom discharge stream of the decomposition apparatus is 0.05 to 1.0.

12. The method of claim 1 , wherein the active ingredient includes one or more compounds selected from the group consisting of phenol, alpha-methyl styrene, and cumene.

Assignees

• Lg Chemical Ltd

Inventors

• Kang Min Suk
• Lee Sang Beom
• Jang Chi Hyun

Classifications

• C07C37/72 Primary

  by liquid-liquid treatment · CPC title

• C07C1/20 Primary

  starting from organic compounds containing only oxygen atoms as heteroatoms · CPC title

• C07C4/22

  by depolymerisation to the original monomer, e.g. dicyclopentadiene to cyclopentadiene · CPC title

• C07C37/005

  by obtaining phenols from products, waste products or side-products of processes, not directed to the production of phenols, by conversion or working-up · CPC title

• C07C37/52

  by splitting polyaromatic compounds, e.g. polyphenolalkanes · CPC title